1 #ifndef __NET_PKT_SCHED_H
2 #define __NET_PKT_SCHED_H
4 #include <linux/jiffies.h>
5 #include <linux/ktime.h>
6 #include <linux/if_vlan.h>
7 #include <net/sch_generic.h>
8 #include <uapi/linux/pkt_sched.h>
10 #define DEFAULT_TX_QUEUE_LEN 1000
16 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
19 #define QDISC_ALIGNTO 64
20 #define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
22 static inline void *qdisc_priv(struct Qdisc *q)
24 return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
28 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
30 Normal IP packet size ~ 512byte, hence:
32 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
35 10msec resolution -> <50Kbit/sec.
37 The result: [34]86 is not good choice for QoS router :-(
39 The things are not so bad, because we may use artificial
40 clock evaluated by integration of network data flow
41 in the most critical places.
44 typedef u64 psched_time_t;
45 typedef long psched_tdiff_t;
47 /* Avoid doing 64 bit divide */
48 #define PSCHED_SHIFT 6
49 #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
50 #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
52 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
53 #define PSCHED_PASTPERFECT 0
55 static inline psched_time_t psched_get_time(void)
57 return PSCHED_NS2TICKS(ktime_get_ns());
60 static inline psched_tdiff_t
61 psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
63 return min(tv1 - tv2, bound);
66 struct qdisc_watchdog {
72 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
73 void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires);
75 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
76 psched_time_t expires)
78 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
81 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
83 extern struct Qdisc_ops pfifo_qdisc_ops;
84 extern struct Qdisc_ops bfifo_qdisc_ops;
85 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
87 int fifo_set_limit(struct Qdisc *q, unsigned int limit);
88 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
91 int register_qdisc(struct Qdisc_ops *qops);
92 int unregister_qdisc(struct Qdisc_ops *qops);
93 void qdisc_get_default(char *id, size_t len);
94 int qdisc_set_default(const char *id);
96 void qdisc_hash_add(struct Qdisc *q, bool invisible);
97 void qdisc_hash_del(struct Qdisc *q);
98 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
99 struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
100 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
102 void qdisc_put_rtab(struct qdisc_rate_table *tab);
103 void qdisc_put_stab(struct qdisc_size_table *tab);
104 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
105 int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
106 struct net_device *dev, struct netdev_queue *txq,
107 spinlock_t *root_lock, bool validate);
109 void __qdisc_run(struct Qdisc *q);
111 static inline void qdisc_run(struct Qdisc *q)
113 if (qdisc_run_begin(q))
117 static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
119 /* We need to take extra care in case the skb came via
120 * vlan accelerated path. In that case, use skb->vlan_proto
121 * as the original vlan header was already stripped.
123 if (skb_vlan_tag_present(skb))
124 return skb->vlan_proto;
125 return skb->protocol;
128 /* Calculate maximal size of packet seen by hard_start_xmit
129 routine of this device.
131 static inline unsigned int psched_mtu(const struct net_device *dev)
133 return dev->mtu + dev->hard_header_len;
136 static inline bool is_classid_clsact_ingress(u32 classid)
138 /* This also returns true for ingress qdisc */
139 return TC_H_MAJ(classid) == TC_H_MAJ(TC_H_CLSACT) &&
140 TC_H_MIN(classid) != TC_H_MIN(TC_H_MIN_EGRESS);
143 static inline bool is_classid_clsact_egress(u32 classid)
145 return TC_H_MAJ(classid) == TC_H_MAJ(TC_H_CLSACT) &&
146 TC_H_MIN(classid) == TC_H_MIN(TC_H_MIN_EGRESS);